I have no idea how this could be tested, but I do wonder if braces have more resistance to warping due to environmental changes when glued on the quarter sawn side (grain going vertically) or the flat sawn side (grain going flat). I would have always assumed the vertical grain would be best, but this test ruins my assumptions. Thanks for sharing.
Come to think of it, I once received a bowed fingerboard that was perfectly quartersawn, and it was bowed along the vertical grain.
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